TextItem cursor position in IE8/9 when launched from a iFrame

Dear Isomorphic Support:

I have a TextItem in my form. My SmartGwt application is in iframe of other SmartGwt application.
In IE8 and IE9 there is problem with cursor position in TextItem: cursor periodically moves to the start of TextItem during typing.

When I turn on IE compatibility mode, the problem goes away but it leads to other visual bugs.
If I render my app directly outside of an iFrame, the problem goes away also.

I found similar topic: http://forums.smartclient.com/showthread.php?t=24409 but it didn't help.

Details:
Product: SmartGWT 4.0p LGPL
Browser: IE 8, IE 9